Packet Clearing House investigates technological, economic, and policy issues in areas related to Internet traffic exchange.

PCH's longest-running research project is the Internet Routing Topology Archive, a database of Internet topology measurements begun in 1997. This archive of routing data from all major and many minor Internet provider networks is available to academic and commercial researchers and the operations community, to aid in the understanding of the dynamic nature and topology of the Internet.

Other topics of ongoing research include the economic impact of local traffic exchange in developing nations, inter-provider notifications and communication, and database schemas for topological data.